NAME
tan, tanf, tanl - tangent function SYNOPSIS
#include
double tan(double x); float tanf(float x); long double tanl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): tanf(), tanl(): BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 200112L;
or cc -std=c99 DESCRIPTION The tan() function returns the tangent of x, where x is given in radi‐ ans. RETURN VALUE On success, these functions return the tangent of x. If x is a NaN, a NaN is returned. If x is positive infinity or negative infinity, a domain error occurs, and a NaN is returned. If the correct result would overflow, a range error occurs, and the functions return HUGEVAL, HUGEVALF, or HUGEVALL, respectively, with the mathematically correct sign. ERRORS See matherror(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is an infinity
errno is set to EDOM (but see BUGS). An invalid floating-point exception (FEINVALID) is raised. Range error: result overflow
An overflow floating-point exception (FEOVERFLOW) is raised. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌──────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────┼───────────────┼─────────┤
│tan(), tanf(), tanl() │ Thread safety │ MT-Safe │ └──────────────────────┴───────────────┴─────────┘ CONFORMING TO
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89. BUGS Before version 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred. SEE ALSO acos(3), asin(3), atan(3), atan2(3), cos(3), ctan(3), sin(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2010-09-11 TAN(3)